Situation, when the refrigerator is not working well, can take any home cook or owner by surprise, because the safety of food and comfort in the kitchen depend on the serviceability of the unit. The first alarm bells are often insufficiently low temperatures, the formation of ice, or, conversely, a complete lack of cold in one of the chambers. Before calling a technician, it is worth carrying out an initial diagnosis, since in many cases the problem lies in simple things that do not require complex intervention.
Why did the refrigerator stop freezing properly? There can be many answers: from a banal overload of products to a serious freon leak. It is important not to panic and consistently check the main components and operating conditions. Often the cause is a violation of the rules for placing equipment or a simple blockage of the ventilation system. If you notice that compressor works without stopping or, on the contrary, turns on extremely rarely, this is a signal for immediate action.
In this article we will look in detail at what to do if the refrigerator does not cool well, and how to identify the fault yourself. We will look at both mechanical damage and software failures in modern models. Understanding the operating principles of your model, whether it is old Atlant or modern Bosch with the system No Frost, will help you make the right decision about repairs.
Primary diagnostics: checking operating conditions
Before looking for complex technical faults, you need to make sure that the refrigerator is installed correctly. Often the reason why the device poor freezingis simply overheating. If the unit is placed close to a wall or in a niche without gaps, the heat from the condenser cannot be effectively dissipated into the environment. This leads to a decrease in compressor performance and an increase in temperature inside the chambers.
Pay attention to the position of the door and the condition of the seals. If the elastic band seal does not fit tightly, warm air from the room constantly enters the chamber. The compressor tries to compensate for the loss of cold by working in increased mode, but cannot cope with the load. Check that the magnetic tape is clean and that there are no crumbs or grease that would prevent it from closing tightly.
⚠️ Attention: If you have recently moved the refrigerator, make sure that enough time has passed (at least 2-3 hours) before turning it on so that the oil in the compressor flows into the crankcase. Starting immediately after transportation can lead to water hammer.
It is also worth checking the temperature conditions. Perhaps someone in the household accidentally changed the settings, setting the temperature too high. For the main camera, the range from +2 to +5 degrees Celsius is considered the norm. If the value is set higher, the products may deteriorate, creating the illusion of breakage.
Problems with the defrosting system and ice
One of the most common reasons why the refrigerator does not cool enoughis the formation of an excessive layer of ice on the evaporator. In models with manual defrosting, the ice “coat” acts as a heat insulator, preventing heat from being removed from the chambers. In systems No Frost the defrost system is responsible for removing moisture, and if it fails, ice blocks the air circulation channels.
If you see that the back wall in the refrigerator compartment is covered with a thick layer of frost, and the food near it freezes, but otherwise Warmth in the space is a clear sign of problems with defrosting. In such cases, the defrost sensor or timer often fails. The control unit “thinks” that the evaporator is clean and does not turn on the heating element to remove ice. Defrost heating element, defrost sensor or timer. The control unit "thinks" that the evaporator is clean and does not turn on the heating element to remove ice.
What can you do yourself? The easiest method is complete defrosting. Disconnect the device from the mains, open the doors and leave it for at least 10-12 hours (preferably for a day). This will allow the ice to completely melt and clear the drainage holes. After defrosting, wipe the chambers dry and turn on the refrigerator. If the problem was only an ice jam, work should return to normal.
Why can’t you chip off ice with a knife?
Mechanical removal of ice with sharp objects is strictly prohibited. You may damage the evaporator tubes through which the refrigerant circulates. Even a microscopic puncture will lead to an instant leak of freon and expensive repairs, which are often not economically feasible.
Faults of the compressor and start relay
The heart of any refrigerator is compressor. If it does not work correctly, normal cold is out of the question. Symptoms can be different: the engine hums, but does not start; turns on for a few seconds and clicks when turning off; or it works constantly, without turning off, but without creating the required pressure in the system.
Often the culprit of the problems is the starting relay. This is a small part that provides the impulse to start the engine. If the relay contacts are oxidized or burned, the compressor cannot start, making a characteristic clicking sound. Replacing the relay is a relatively simple and inexpensive procedure that you can do yourself if you have basic skills.
A more serious situation is the failure of the compressor itself or loss of its performance (compression). If the valves inside the motor are worn out, it will drive freon in a circle, but will not create the necessary pressure for the refrigerant to boil in the evaporator. In this case, the refrigerator can work for days, but the temperature inside will be only slightly lower than room temperature.
☑️ Compressor diagnostics
Refrigerant leak and capillary system clogged
If the compressor is working, the relay is working, ice no, but the cold is still not enough, there is a high probability of leakage freon or blockage. A refrigerant is a substance that, as it circulates through a system, picks up heat. If its quantity decreases due to a microcrack in the tubes or corrosion, the cooling efficiency drops in proportion to the loss of gas.
Clogged capillary tube is another technical malfunction. Plugs from oil or moisture breakdown products may form in the circulation system. This prevents the normal flow of freon. A characteristic sign of a blockage is a running compressor, a hot condenser (grid at the back), but a cold or warm evaporator inside the chamber.
It is almost impossible to eliminate a leak or blockage on your own. This requires:
- 🔍 Special equipment for leak detection (leak detector, nitrogen).
- 🛠️ Vacuum pump to remove moisture and air from the system.
- ⚖️ Dispenser for refilling the exact amount of freon indicated on the nameplate.
Attempts to “top up” the gas without eliminating the cause of the leak will only give a temporary effect. In addition, different models require different types of refrigerant (R134a, R600a), and mixing them is unacceptable.
Failures in electronics and thermoregulation
Modern refrigerators are crammed with electronics, and often the problem of “poor cooling” lies in control failures. If thermostat (in mechanical models) or the electronic temperature sensor (in models with a display) transmits incorrect data to the control module, the compressor may not turn on on time.
For example, if the sensor is “stuck” and shows that inside is -10°C, although in fact +15°C, the module control will not give a command to start the compressor. As a result, the products will flow. In mechanical thermostats, the problem is solved by replacing the capillary tube of the thermostat; in electronic thermostats, by replacing the sensor.
It is also worth mentioning solenoid valves in dual-compressor or dual-circuit systems. If the valve that opens the supply of freon to the refrigerator compartment is stuck in the closed position, the cold will only be in the freezer, and the upper compartment will become warm.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor does not turn on, there is no light | No power, the module is burned out | Average |
| The motor hums and clicks | Faulty starting relay | Low |
| Cold only at the back wall | Fan faulty (No Frost) | Medium |
| Motor works without stopping | Freon leak, blockage, compression wear | High |
Frequent questions and answers (FAQ)
Why does the refrigerator work, but the upper chamber does not freeze?
Most often this indicates a problem with air circulation (the channel in the No Frost system is frozen), a malfunction of the damper that regulates the flow of cold air, or a freon leak, in which there is only enough for the freezer compartment.
Is it possible to operate a refrigerator if it does not freeze well?
Short-term - yes, if you monitor the temperature of the food. However, prolonged operation in this mode is harmful to the compressor, which can burn out from overload. In addition, there is a risk of food spoilage and bacterial growth.
How often do you need to defrost the refrigerator?
Models with the system No Frost require defrosting only for hygienic cleaning (1-2 times a year). Drip systems and models with manual defrosting need to be cleared of ice when its layer reaches 5-7 mm, usually this happens every 3-6 months.
Why does the refrigerator take a long time to get cold after defrosting?
This is normal. After complete defrosting, the system takes from 2 to 24 hours to reach operating temperature conditions, especially if a lot of warm food was loaded into the chambers. Do not overload the chamber during the first hours of operation.
Does the amount of food in the refrigerator affect the quality of cooling?
Yes, it does. A half-empty refrigerator loses cold faster when the door is opened, and an overloaded one (when food covers the ventilation holes) disrupts air circulation. It is optimal to fill the volume by 60-70%.